Help, I have a male mascovy duck, he got sick, we took him to the vet and they found one parasite, He was treated for that and has vitamin B12 injections. He is very alert and fiesty,looks very good. He is also eating and drinking as much as a normal duck. I have been putting him in a big wash pan and cleaning him and working his legs and we have been giving him Brewers yeast in his food which he eats about a tablespoon a day of yeast for niacin. It's been about a week since we started doing that. He still doesn't use his legs and he is not injured. Any thoughts? Dale